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Automotive catalyst oxygen storage capacity diagnostic

Inactive Publication Date: 2005-04-05
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

An engine exhaust system according to the present invention includes a catalytic converter. An inlet sensor senses a first oxygen level of exhaust gases entering the catalytic converter. An outlet sensor senses a second oxygen level of exhaust gases exiting the catalytic converter. A controller communicates with a fuel system of an engine

Problems solved by technology

Therefore, the loss in OSC is related to the loss in conversion capability.

Method used

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  • Automotive catalyst oxygen storage capacity diagnostic
  • Automotive catalyst oxygen storage capacity diagnostic
  • Automotive catalyst oxygen storage capacity diagnostic

Examples

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Embodiment Construction

The following description of the preferred embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. For purposes of clarity, the same reference numbers will be used in the drawings to identify similar elements.

Referring now to FIG. 1, a vehicle 10 includes an engine 12, an exhaust 14 and a controller 16. The engine 12 includes an intake manifold 17, a throttle position sensor (TPS) 18 and a mass air flow (MAF) sensor 20. The throttle position sensor 18 and the MAF sensor 20 communicate with the controller 16. The exhaust 14 includes a catalytic converter 22, a pre-catalyst or inlet oxygen sensor 24, and a post-catalyst or outlet oxygen sensor 26. The inlet and outlet oxygen sensors 24, 26 communicate with the controller 16 to provide inlet and outlet F / A ratio signals, respectfully. The controller 16 communicates with a fuel system 28 to regulate fuel flow to the engine 12. In this manner, the controller 16 regulates the F / ...

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Abstract

An engine exhaust system includes a catalytic converter. An inlet sensor senses a first oxygen level of exhaust gases entering the catalytic converter. An outlet sensor senses a second oxygen level of exhaust gases exiting the catalytic converter. A controller communicates with a fuel system of an engine, the inlet sensor, and the outlet sensor. The controller initiates a rich condition after a fuel cut-off period and calculates a mass of oxygen released by the catalytic converter based on a mass air flow into the engine. The controller calculates a target oxygen storage capacity (OSC) of the catalytic converter over a target time period.

Description

FIELD OF THE INVENTIONThe present invention relates to diagnostic systems for vehicles, and more particularly to a method and apparatus for monitoring catalytic converter efficiency.BACKGROUND OF THE INVENTIONDuring the combustion process, gasoline is oxidized and hydrogen (H) and carbon (C) combine with air. Various chemical compounds are formed including carbon dioxide (CO2), water (H2O), carbon monoxide (CO), nitrogen oxides (NOx), unburned hydrocarbons (HC), sulfur oxides (SOx), and other compounds.Automobile exhaust systems include a catalytic converter that reduces the levels of CO, HC, and NOx in the exhaust gas by chemically converting these gasses into carbon dioxide, nitrogen, and water. Diagnostic regulations require periodic monitoring of the catalytic converter for proper conversion capability. Typical monitoring methods employ two exhaust gas oxygen sensors and infer the conversion capability of the catalytic converter using the sensor signals. One sensor monitors the ...

Claims

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Application Information

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IPC IPC(8): F01N11/00F02D41/02F02D41/18F02D41/12F02D41/14
CPCF01N11/007F02D41/0295F02D41/18F02D41/126F01N2550/02Y02T10/47F02D41/1441F02D2200/0816Y02T10/40
Inventor YURGIL, JAMES R.GUNSELMAN, JOHN M.
Owner GM GLOBAL TECH OPERATIONS LLC
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